Motional EMF
A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity. . The magnetic field is directed along the negative z axis direction. The induced emf, during the passes of these loops, out of the field region, will not remain constant for
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Answer: (a)
- , where is the length of the loop cut by the field boundary at that instant.
- Rectangle and square: the boundary cuts a constant width, so emf is constant.
- Circle and ellipse: the chord at the boundary changes with time, so emf changes.
- So the answer is (a) the circular and the elliptical loops.